<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2009, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * Router Class
 *
 * Parses URIs and determines routing
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @author		ExpressionEngine Dev Team
 * @category	Libraries
 * @link		http://codeigniter.com/user_guide/general/routing.html
 */
class CI_Router {

  var $config;
  var $routes 		= array();
  var $error_routes	= array();
  var $class			= '';
  var $method			= 'index';
  var $directory		= '';
  var $uri_protocol 	= 'auto';
  var $default_controller;
  var $scaffolding_request = FALSE; // Must be set to FALSE

  /**
   * Constructor
   *
   * Runs the route mapping function.
   */
  function CI_Router() {
    $this->config =& load_class('Config');
    $this->uri =& load_class('URI');
    $this->_set_routing();
    log_message('debug', "Router Class Initialized");
  }

  // --------------------------------------------------------------------

  /**
   * Set the route mapping
   *
   * This function determines what should be served based on the URI request,
   * as well as any "routes" that have been set in the routing config file.
   *
   * @access	private
   * @return	void
   */
  function _set_routing() {
  // Are query strings enabled in the config file?
  // If so, we're done since segment based URIs are not used with query strings.
    if ($this->config->item('enable_query_strings') === TRUE AND isset($_GET[$this->config->item('controller_trigger')])) {
      $this->set_class(trim($this->uri->_filter_uri($_GET[$this->config->item('controller_trigger')])));

      if (isset($_GET[$this->config->item('function_trigger')])) {
        $this->set_method(trim($this->uri->_filter_uri($_GET[$this->config->item('function_trigger')])));
      }

      return;
    }

    // Load the routes.php file.
    @include(APPPATH.'config/routes'.EXT);
    $this->routes = ( ! isset($route) OR ! is_array($route)) ? array() : $route;
    unset($route);

    // Set the default controller so we can display it in the event
    // the URI doesn't correlated to a valid controller.
    $this->default_controller = ( ! isset($this->routes['default_controller']) OR $this->routes['default_controller'] == '') ? FALSE : strtolower($this->routes['default_controller']);

    // Fetch the complete URI string
    $this->uri->_fetch_uri_string();

    // Is there a URI string? If not, the default controller specified in the "routes" file will be shown.
    if ($this->uri->uri_string == '') {
      if ($this->default_controller === FALSE) {
        show_error("Unable to determine what should be displayed. A default route has not been specified in the routing file.");
      }

      if (strpos($this->default_controller, '/') !== FALSE) {
        $x = explode('/', $this->default_controller);

        $this->set_class(end($x));
        $this->set_method('index');
        $this->_set_request($x);
      }
      else {
        $this->set_class($this->default_controller);
        $this->set_method('index');
        $this->_set_request(array($this->default_controller, 'index'));
      }

      // re-index the routed segments array so it starts with 1 rather than 0
      $this->uri->_reindex_segments();

      log_message('debug', "No URI present. Default controller set.");
      return;
    }
    unset($this->routes['default_controller']);

    // Do we need to remove the URL suffix?
    $this->uri->_remove_url_suffix();

    // Compile the segments into an array
    $this->uri->_explode_segments();

    // Parse any custom routing that may exist
    $this->_parse_routes();

    // Re-index the segment array so that it starts with 1 rather than 0
    $this->uri->_reindex_segments();
  }

  // --------------------------------------------------------------------

  /**
   * Set the Route
   *
   * This function takes an array of URI segments as
   * input, and sets the current class/method
   *
   * @access	private
   * @param	array
   * @param	bool
   * @return	void
   */
  function _set_request($segments = array()) {
    $segments = $this->_validate_request($segments);

    if (count($segments) == 0) {
      return;
    }

    $this->set_class($segments[0]);

    if (isset($segments[1])) {
    // A scaffolding request. No funny business with the URL
      if ($this->routes['scaffolding_trigger'] == $segments[1] AND $segments[1] != '_ci_scaffolding') {
        $this->scaffolding_request = TRUE;
        unset($this->routes['scaffolding_trigger']);
      }
      else {
      // A standard method request
        $this->set_method($segments[1]);
      }
    }
    else {
    // This lets the "routed" segment array identify that the default
    // index method is being used.
      $segments[1] = 'index';
    }

    // Update our "routed" segment array to contain the segments.
    // Note: If there is no custom routing, this array will be
    // identical to $this->uri->segments
    $this->uri->rsegments = $segments;
  }

  // --------------------------------------------------------------------

  /**
   * Validates the supplied segments.  Attempts to determine the path to
   * the controller.
   *
   * @access	private
   * @param	array
   * @return	array
   */
  function _validate_request($segments) {
  // Does the requested controller exist in the root folder?
    if (file_exists(APPPATH.'controllers/'.$segments[0].EXT)) {
      return $segments;
    }

    // Is the controller in a sub-folder?
    if (is_dir(APPPATH.'controllers/'.$segments[0])) {
    // Set the directory and remove it from the segment array
      $this->set_directory($segments[0]);
      $segments = array_slice($segments, 1);

      if (count($segments) > 0) {
      // Does the requested controller exist in the sub-folder?
        if ( ! file_exists(APPPATH.'controllers/'.$this->fetch_directory().$segments[0].EXT)) {
          show_404($this->fetch_directory().$segments[0]);
        }
      }
      else {
        $this->set_class($this->default_controller);
        $this->set_method('index');

        // Does the default controller exist in the sub-folder?
        if ( ! file_exists(APPPATH.'controllers/'.$this->fetch_directory().$this->default_controller.EXT)) {
          $this->directory = '';
          return array();
        }

      }

      return $segments;
    }

    // Can't find the requested controller...
    show_404($segments[0]);
  }

  // --------------------------------------------------------------------

  /**
   *  Parse Routes
   *
   * This function matches any routes that may exist in
   * the config/routes.php file against the URI to
   * determine if the class/method need to be remapped.
   *
   * @access	private
   * @return	void
   */
  function _parse_routes() {
  // Do we even have any custom routing to deal with?
  // There is a default scaffolding trigger, so we'll look just for 1
    if (count($this->routes) == 1) {
      $this->_set_request($this->uri->segments);
      return;
    }

    // Turn the segment array into a URI string
    $uri = implode('/', $this->uri->segments);

    // Is there a literal match?  If so we're done
    if (isset($this->routes[$uri])) {
      $this->_set_request(explode('/', $this->routes[$uri]));
      return;
    }

    // Loop through the route array looking for wild-cards
    foreach ($this->routes as $key => $val) {
    // Convert wild-cards to RegEx
      $key = str_replace(':any', '.+', str_replace(':num', '[0-9]+', $key));

      // Does the RegEx match?
      if (preg_match('#^'.$key.'$#', $uri)) {
      // Do we have a back-reference?
        if (strpos($val, '$') !== FALSE AND strpos($key, '(') !== FALSE) {
          $val = preg_replace('#^'.$key.'$#', $val, $uri);
        }

        $this->_set_request(explode('/', $val));
        return;
      }
    }

    // If we got this far it means we didn't encounter a
    // matching route so we'll set the site default route
    $this->_set_request($this->uri->segments);
  }

  // --------------------------------------------------------------------

  /**
   * Set the class name
   *
   * @access	public
   * @param	string
   * @return	void
   */
  function set_class($class) {
    $this->class = $class;
  }

  // --------------------------------------------------------------------

  /**
   * Fetch the current class
   *
   * @access	public
   * @return	string
   */
  function fetch_class() {
    return $this->class;
  }

  // --------------------------------------------------------------------

  /**
   *  Set the method name
   *
   * @access	public
   * @param	string
   * @return	void
   */
  function set_method($method) {
    $this->method = $method;
  }

  // --------------------------------------------------------------------

  /**
   *  Fetch the current method
   *
   * @access	public
   * @return	string
   */
  function fetch_method() {
    if ($this->method == $this->fetch_class()) {
      return 'index';
    }

    return $this->method;
  }

  // --------------------------------------------------------------------

  /**
   *  Set the directory name
   *
   * @access	public
   * @param	string
   * @return	void
   */
  function set_directory($dir) {
    $this->directory = $dir.'/';
  }

  // --------------------------------------------------------------------

  /**
   *  Fetch the sub-directory (if any) that contains the requested controller class
   *
   * @access	public
   * @return	string
   */
  function fetch_directory() {
    return $this->directory;
  }

}
// END Router Class

/* End of file Router.php */
/* Location: ./system/libraries/Router.php */